??????????????53%??

????:?????:???????150

??????????(?????????):6??17?????30?????????????,??????????????,53%?????????????

??,???????3.31??,??????“???????????”?????????“???????????”??????????????“?????????”??4.8??,????12.8??????????????,????1978?5.05%??????13.84%???4?????????????,??????????515??1000???,???????????????,2019??????????????2000??????40%???,??????????????,4.5?????

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